Drilldown: Patents

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Patents > Year granted: 1890 - 1899 & Inventor country : RU or None & First filing: No

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navigation (10) · propulsion (8) · LTA (7) · aerostat (5) · None (4) · dirigible (3) · propeller (3) · flapping (3) · electricity (3) · hybrid (3) · airplane (3)
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